# Airworthiness directives, 1977

FAA airworthiness directives effective in 1977: 203 ADs with their full text, status and the aircraft they apply to.

Page 1 of 5 · 203 ADs

- [AD 74-20-10](https://openairdocs.org/ad/74-20-10.md): Emergency Locator Transmitter · Leigh Systems Emergency Locator Transmitter · Effective Dec 30, 1977
- [AD 74-15-06](https://openairdocs.org/ad/74-15-06.md): Tail Rotor Gear Box · Sikorsky S-58A, S-58B, S-58BT and 12 more · Effective Dec 30, 1977
- [AD 77-25-04](https://openairdocs.org/ad/77-25-04.md): Clevis Pins · Alexander Schleicher Rhonlerche II · Effective Dec 27, 1977
- [AD 77-23-08](https://openairdocs.org/ad/77-23-08.md): Cracks in Main Rotor Blades · Schweizer 269A, 269A-1 and 269B · Effective Dec 27, 1977
- [AD 77-25-05](https://openairdocs.org/ad/77-25-05.md): Idle Mixture · Enstrom Helicopter Corporation, The 280C and F-28C · Effective Dec 21, 1977
- [AD 77-12-06](https://openairdocs.org/ad/77-12-06.md): Blade Shank · Hartzell Propeller BHC-12YF-4, BHC-C2Y, BHC-G2YF-1 and 115 more · Historical · Effective Dec 21, 1977 · Replaced by AD 2002-09-08
- [AD 77-13-21](https://openairdocs.org/ad/77-13-21.md): Prevent Landing Gear Collapse · Piper PA-24, PA-24-250, PA-24-260 and 3 more · Effective Dec 16, 1977
- [AD 77-25-02](https://openairdocs.org/ad/77-25-02.md): Engine Fire Detection System · Sabreliner NA-265-70 and NA-265-80 · Effective Dec 12, 1977
- [AD 77-23-05](https://openairdocs.org/ad/77-23-05.md): Wing or Empennage Assemblies · British Aerospace, Aircraft Group B.206 Series 1 and B.206 Series 2 · Effective Dec 10, 1977
- [AD 77-23-04](https://openairdocs.org/ad/77-23-04.md): Total-Pressure Probes · Dassault Falcon 10 · Effective Dec 10, 1977
- [AD 77-23-02](https://openairdocs.org/ad/77-23-02.md): Propeller Feathering System · BAE Systems HS 748 Series 2A · Effective Dec 7, 1977
- [AD 76-21-04](https://openairdocs.org/ad/76-21-04.md): High Pressure Compressor · General Electric CF6-6D and CF6-6D1 · Effective Nov 30, 1977
- [AD 77-24-02](https://openairdocs.org/ad/77-24-02.md): Flap Support Structure · Short Brothers SC-7 Skyvan Series 3 · Effective Nov 28, 1977
- [AD 77-23-11](https://openairdocs.org/ad/77-23-11.md): ELT Installation · Cessna 182, 182A, 182B and 16 more · Effective Nov 28, 1977
- [AD 77-22-04](https://openairdocs.org/ad/77-22-04.md): Landing Gear · Airbus Helicopters SA341G · Effective Nov 28, 1977
- [AD 77-21-09](https://openairdocs.org/ad/77-21-09.md): Aileron Rudder Balance Interconnect Mechanism · Lockheed Martin 188A and 188C · Effective Nov 25, 1977
- [AD 76-20-03](https://openairdocs.org/ad/76-20-03.md): Seal Clearances · Pratt & Whitney Division JT9D-20, JT9D-3A, JT9D-7 and 4 more · Effective Nov 16, 1977
- [AD 77-08-02](https://openairdocs.org/ad/77-08-02.md): Electrical Short · Piper PA-31, PA-31-300, PA-31-325 and 3 more · Effective Nov 15, 1977
- [AD 77-23-03](https://openairdocs.org/ad/77-23-03.md): Rod End Bearings · Piper PA-28-140, PA-28-151, PA-28-161 and 12 more · Effective Nov 14, 1977
- [AD 77-21-07](https://openairdocs.org/ad/77-21-07.md): Wiring · Airbus Helicopters Deutschland BO-105A and BO-105C · Effective Nov 14, 1977
- [AD 77-21-01](https://openairdocs.org/ad/77-21-01.md): Tail Rotor Gear Boxes · Scotts-Bell 47 47, 47B, 47B3 and 21 more · Effective Nov 14, 1977
- [AD 77-21-05](https://openairdocs.org/ad/77-21-05.md): High Pressure Turbine Discs · Rolls-Royce Deutschland Dart 527, Dart 528-7E, Dart 528D-7E and 28 more · Effective Nov 11, 1977
- [AD 77-22-05](https://openairdocs.org/ad/77-22-05.md): Operating Limitations · American Champion 7ECA, 7GC, 7GCA and 5 more · Effective Nov 7, 1977
- [AD 77-20-06](https://openairdocs.org/ad/77-20-06.md): Wing Strut Corrosion · Pilatus PC-6, PC-6-H1, PC-6-H2 and 11 more · Effective Nov 3, 1977
- [AD 77-22-02](https://openairdocs.org/ad/77-22-02.md): Nose Landing Gear Engine Mount · Alexandria 14-19-3, 14-19-3A, 17-30 and 1 more · Effective Nov 2, 1977
- [AD 77-02-01](https://openairdocs.org/ad/77-02-01.md): Wing Skin And Spar Cracks · Boeing 707-300 Series, 707-300B Series, 707-300C Series and 1 more · Effective Nov 1, 1977 · Supersedes AD 64-11-01 R7
- [AD 77-22-03](https://openairdocs.org/ad/77-22-03.md): Ring Segment - VHF Antenna · Lockheed Martin 1329-23A, 1329-23D, 1329-23E and 1 more · Effective Oct 28, 1977
- [AD 77-21-06](https://openairdocs.org/ad/77-21-06.md): Fuselage Steel Tubing Cluster · Lavia Argentina PA-25, PA-25-235 and PA-25-260 · Effective Oct 19, 1977
- [AD 77-21-03](https://openairdocs.org/ad/77-21-03.md): Rudder Spar Cracks · Piper PA-36-285 · Effective Oct 18, 1977
- [AD 77-20-02](https://openairdocs.org/ad/77-20-02.md): Tail Rotor Spindle · Enstrom Helicopter Corporation, The 280, 280C, F-28 and 2 more · Effective Oct 6, 1977
- [AD 76-17-08 R1](https://openairdocs.org/ad/76-17-08-R1.md): Main Rotor Shaft · Enstrom Helicopter Corporation, The 280, F-28 and F-28A · Historical · Effective Oct 4, 1977 · Replaced by AD 2001-22-01
- [AD 76-17-08](https://openairdocs.org/ad/76-17-08.md): Main Rotor Shaft · Enstrom Helicopter Corporation, The 280, F-28 and F-28A · Historical · Effective Oct 4, 1977 · Replaced by AD 2001-22-01
- [AD 77-18-06](https://openairdocs.org/ad/77-18-06.md): Horizontal Stabilizer · Boeing 727-100 Series, 727-100C Series, 727-200 Series and 3 more · Effective Oct 3, 1977
- [AD 77-19-07](https://openairdocs.org/ad/77-19-07.md): Control Column Assembly · Textron 18A, 18D, 18S (Army C-45C) and 27 more · Effective Sep 29, 1977
- [AD 77-19-06](https://openairdocs.org/ad/77-19-06.md): Aileron Cables · Piper PA-31, PA-31-300, PA-31-325 and 1 more · Effective Sep 27, 1977
- [AD 77-19-03](https://openairdocs.org/ad/77-19-03.md): Main Rotor Retention Straps · MD Helicopters 369D · Effective Sep 27, 1977
- [AD 77-15-12](https://openairdocs.org/ad/77-15-12.md): Power Turbine Coupling Nut · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 23 more · Effective Sep 23, 1977
- [AD 77-19-05](https://openairdocs.org/ad/77-19-05.md): Flying Wire Terminals · Allied Ag Cat Productions G-164A, G-164B, G-164B-15T and 3 more · Effective Sep 22, 1977
- [AD 77-18-07](https://openairdocs.org/ad/77-18-07.md): Elevator Drive System · Lockheed Martin L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15 and 1 more · Effective Sep 15, 1977
- [AD 74-23-06](https://openairdocs.org/ad/74-23-06.md): Operating Limitations · Boeing DC-8-11, DC-8-12, DC-8-21 and 24 more · Effective Sep 15, 1977
- [AD 77-18-05](https://openairdocs.org/ad/77-18-05.md): Variable Authority Steering System · M7 Aerospace SA226-AT, SA226-T and SA226-TC · Effective Sep 12, 1977
- [AD 77-18-04](https://openairdocs.org/ad/77-18-04.md): Cabin Pressurization · Textron 200, 200T, A100 and 3 more · Effective Sep 12, 1977
- [AD 75-24-09](https://openairdocs.org/ad/75-24-09.md): Ground Spoilers · Boeing 737-100 Series and 737-200 Series · Effective Sep 12, 1977
- [AD 77-16-10](https://openairdocs.org/ad/77-16-10.md): Navigation Systems · Mitchell Industries Navigation Systems · Effective Sep 8, 1977
- [AD 77-16-07](https://openairdocs.org/ad/77-16-07.md): Main Rotor Gearbox · Airbus Helicopters Deutschland BO-105A and BO-105C · Effective Sep 6, 1977
- [AD 77-21-04](https://openairdocs.org/ad/77-21-04.md): Clutch and Shaft Assembly · MD Helicopters 369, 369A, 369D and 4 more · Effective Aug 31, 1977
- [AD 77-18-01](https://openairdocs.org/ad/77-18-01.md): Engine Oil Cooler · Mooney M20E, M20F and M20J · Effective Aug 31, 1977
- [AD 77-16-12](https://openairdocs.org/ad/77-16-12.md): Low Turbine Shaft · Pratt & Whitney Division JT8D-1, JT8D-11, JT8D-15 and 8 more · Effective Aug 31, 1977
- [AD 77-16-04](https://openairdocs.org/ad/77-16-04.md): Wing Structure · de Havilland Aircraft Co., Ltd., The D.H. 104 Dove Series 1A, D.H. 104 Dove Series 2A, D.H. 104 Dove Series 5A and 7 more · Effective Aug 31, 1977
- [AD 77-16-02](https://openairdocs.org/ad/77-16-02.md): Pistons · Dowty Propellers (c) R.209/4-40-4.5, (c) R.245/4-40-4.5 and (c) R.259/4-40-4.5 · Effective Aug 31, 1977

Next page: https://openairdocs.org/ad.md?year=1977&page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT d.ad_number, d.status, d.subject, d.makes, d.models, d.effective_date
FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d
WHERE year(coalesce(d.effective_date, d.publication_date, d.issue_date)) = 1977
ORDER BY coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number DESC
```

This list as a web page: https://openairdocs.org/ad?year=1977

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